Preparation and characterization of novel grafted polyethylene based azo-polymers bearing oligo(ethylene glycol) spacers

Rivera, Ernesto; Carreón-Castro, María del Pilar; Salazar, Roberto; Huerta, Gloria; Becerril, Carmen; Rivera, L. Tamayo

doi:10.1016/j.polymer.2007.04.058

Cited by 30 publications

(37 citation statements)

References 30 publications

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“…RED-PEG-2, RED-PEG-3, RED-PEG-4 and RED-PEG-6 have been synthesized according to the method previously reported by us [25]. The preparation of the nPEGMAN monomers and the pnPEGMAN polymers is illustrated in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…These dyes were incorporated into a low-density polyethylene (LDPE) matrix, using acryloyl chloride as grafting agent and gamma radiation, in order to obtain a series of grafted azopolymer films containing oligo(ethylene glycol) segments (AC-g-PE-RED-PEG series). These materials showed high moisture sensitivity, giving rise to solvatochromic effects upon exposure to steam, which make them good prospects for the elaboration of humidity sensors [25].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Novel Amphiphilic Azo-Polymers Bearing Well-Defined Oligo(Ethylene Glycol) Spacers

García

Carreón-Castro

Gelover-Santiago

et al. 2012

Designed Monomers and Polymers

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Novel Amphiphilic Azo-Polymers Bearing Well-Defined Oligo(Ethylene Glycol) Spacers

García

Carreón-Castro

Gelover-Santiago

et al. 2012

Designed Monomers and Polymers

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“…Dichloromethane was dried by distillation over calcium hydride and anhydrous toluene was employed. Precursor azo-dyes were synthesized according to the method previously reported by us, 23,24,30 whereas N-ethyl-N-(2-hydroxyethyl)-4-(4-nitrophenylazo) aniline (Disperse Red-1, DR1) was purchased from Aldrich. The fullerene C 60 was incorporated into azobenzene derivatives as described in the literature.…”

Section: General Conditionsmentioning

confidence: 99%

“…The last step consisted on the incorporation of fullerene C 60 into the precursor malonates by means of a Bingel reaction to give six different fullerene C 60 -azobenzene derivatives (15, 16, 17, 18, 19 and 20). Precursor substituted azobenzenes 4, 5, and 7 have been prepared according to the method previously reported by us, 30,33 whereas substituted azobenzenes 3 and 6 were synthesized using a similar procedure.…”

Section: Synthesis Of the Fullerene C 60 -Azobenzene Derivativesmentioning

confidence: 99%

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Synthesis, characterization and optical properties of novel dendronized azo-dyes containing a fullerene C₆₀ unit and well-defined oligo(ethylene glycol) segments

et al. 2017

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Herein, we report the preparation and characterization of a novel series of dendronized azo-dyes containing a fullerene C 60 unit and well-defined oligo(ethylene glycol) spacers. The azobenzene units present in these dyes were substituted in the 4 0 -position with different functional groups (-H, -OCH 3 , -C 4 H 9 , -CN and -NO 2 ). The optical properties of these compounds were studied by absorption spectroscopy as a function of the dipole moment of the azobenzene moieties. All fullerene C 60 -azobenzene derivatives exhibited trans-cis photoisomerization and photoprotonation under irradiation with UV-light. The results were compared to those obtained with their precursor azo-dyes without fullerene C 60 . It was found that the presence of the fullerene unit significantly quenches the photoisomerization yield, whereas the photoprotonation was not affected by the presence of this chromophore.

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A clustered ground‐glass hepatocyte pattern represents a new prognostic marker for the recurrence of hepatocellular carcinoma after surgery

Tsai

Lin

et al. 2011

Cancer

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BACKGROUND:The recurrence of hepatocellular carcinoma (HCC) after hepatectomy is a serious event. It has been demonstrated that different ground-glass hepatocyte (GGH) patterns harbor specific hepatitis B virus (HBV) pre-S deletion mutants and represent preneoplastic lesions in chronic HBV infection. In the current study, the authors investigated whether a specific GGH pattern in nontumorous liver tissues was associated with the recurrence of HBVrelated HCC after surgery. METHODS: Clinicopathologic data from 82 patients with HBV-related HCC were reviewed. GGH patterns were assessed on hematoxylin and eosin-stained sections. Tissue hepatitis B surface antigen (HBsAg) expression was evaluated by immunohistochemical staining. Serum profiles of pre-S status, viral load, and HBV genotype were determined and correlated with clinical recurrence and survival after surgery. RESULTS: The results indicated that the clustered pattern of GGHs or HBsAg expression was associated significantly with decreased local recurrence-free survival (LRFS) during a mean follow-up of 46.4 months (P<.001). This biomarker was comparable to or better than the prognostic value of other parameters, such as multifocal tumors (P ¼ .022), satellite nodules (P ¼ .005), small cell dysplasia (P ¼ .045), or elevated viral load (P ¼ .027), to predict recurrent HCC. Multivariate analysis also revealed that type II GGHs, which expressed marginal HBsAg and consistently clustered in nodules, were independent variables associated with LRFS (P<.001) and overall survival (P ¼ .003). CONCLUSIONS: The current results indicated that the assessment of GGH patterns or HBsAg expression in nontumorous liver tissues provides an easily recognized, new risk marker for the recurrence of HBV-related HCC after hepatic resection. Cancer 2011;117:2951-60.

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Preparation and characterization of novel grafted polyethylene based azo-polymers bearing oligo(ethylene glycol) spacers

Cited by 30 publications

References 30 publications

Synthesis and Characterization of Novel Amphiphilic Azo-Polymers Bearing Well-Defined Oligo(Ethylene Glycol) Spacers

Synthesis and Characterization of Novel Amphiphilic Azo-Polymers Bearing Well-Defined Oligo(Ethylene Glycol) Spacers

Synthesis, characterization and optical properties of novel dendronized azo-dyes containing a fullerene C₆₀ unit and well-defined oligo(ethylene glycol) segments

A clustered ground‐glass hepatocyte pattern represents a new prognostic marker for the recurrence of hepatocellular carcinoma after surgery

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Preparation and characterization of novel grafted polyethylene based azo-polymers bearing oligo(ethylene glycol) spacers

Cited by 30 publications

References 30 publications

Synthesis and Characterization of Novel Amphiphilic Azo-Polymers Bearing Well-Defined Oligo(Ethylene Glycol) Spacers

Synthesis and Characterization of Novel Amphiphilic Azo-Polymers Bearing Well-Defined Oligo(Ethylene Glycol) Spacers

Synthesis, characterization and optical properties of novel dendronized azo-dyes containing a fullerene C60 unit and well-defined oligo(ethylene glycol) segments

A clustered ground‐glass hepatocyte pattern represents a new prognostic marker for the recurrence of hepatocellular carcinoma after surgery

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Synthesis, characterization and optical properties of novel dendronized azo-dyes containing a fullerene C₆₀ unit and well-defined oligo(ethylene glycol) segments